JPS61256517A - Extinction of arc for high tension load switch - Google Patents

Extinction of arc for high tension load switch

Info

Publication number
JPS61256517A
JPS61256517A JP9647385A JP9647385A JPS61256517A JP S61256517 A JPS61256517 A JP S61256517A JP 9647385 A JP9647385 A JP 9647385A JP 9647385 A JP9647385 A JP 9647385A JP S61256517 A JPS61256517 A JP S61256517A
Authority
JP
Japan
Prior art keywords
arc
thyristor
movable electrode
fixed electrode
electrode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP9647385A
Other languages
Japanese (ja)
Other versions
JPH0568810B2 (en
Inventor
良作 中田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Kouatsu Electric Co
Original Assignee
Nippon Kouatsu Electric Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Kouatsu Electric Co filed Critical Nippon Kouatsu Electric Co
Priority to JP9647385A priority Critical patent/JPS61256517A/en
Priority to US06/848,187 priority patent/US4754360A/en
Publication of JPS61256517A publication Critical patent/JPS61256517A/en
Publication of JPH0568810B2 publication Critical patent/JPH0568810B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。
(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 本願発明は次に述べる問題点の解決を目的とする。[Detailed description of the invention] The present invention aims to solve the following problems.

(産業上の利用分野) この発明は電源と負荷との間の
電路を開閉するようにしである開閉器において、その開
閉器を作動させる時に生ずるアークを消すようにした方
法に関するものである。
(Industrial Application Field) The present invention relates to a method for extinguishing arcs that occur when the switch is operated to open and close an electric path between a power source and a load.

(従来の技術) この種の開閉器にあうでは電路を開閉
する場合に可動電極と固定電極との間でアークが生じ、
それらの電極の消耗を早める問題点があった。
(Prior art) In this type of switch, an arc is generated between the movable electrode and the fixed electrode when opening and closing the electrical circuit.
There was a problem in that these electrodes wore out quickly.

(発明が解決しようとする問題点) この発明は上記従
来の問題点を除き、上記固定電極と可動電極との間に予
め接続しておいたサイリスクを上記アークが生じ始めた
時に導通させる事によって、上記両電極間でのアークの
発生を抑制できるようにした高圧負荷開閉器における消
弧方法を提供しようとするものである。
(Problems to be Solved by the Invention) This invention solves the above-mentioned problems of the conventional art by making the cyrisk connected in advance between the fixed electrode and the movable electrode conductive when the above-mentioned arc starts to occur. The present invention aims to provide a method for extinguishing an arc in a high-voltage load switch that can suppress the generation of arc between the two electrodes.

本願発明の構成は次の通りである。The configuration of the present invention is as follows.

(問題点を解決する為の手段) 本願発明は前記請求の
範囲記載の通りの手段を講じたものであってその作用は
次の通りである。
(Means for Solving the Problems) The present invention takes the measures as described in the claims above, and its effects are as follows.

(作用) 開閉器における固定電極と可動電極とが離反
しかけてそこにアークが生じ始めた時、そのアークによ
ってサイリスクが導通させられる。
(Function) When the fixed electrode and movable electrode in the switch begin to separate and an arc begins to occur there, the arc causes the cyrisk to conduct.

その結果、上記固定電極と可動電極との間は無電圧とな
りアークの発生が停止する。
As a result, there is no voltage between the fixed electrode and the movable electrode, and arc generation stops.

(実施例)以下本願の実施例を示す図面について説明す
る。第1図において、lは単相乃至三相の交流電源、2
は負荷、3は電源と負荷との間に介設した高圧負荷開閉
器である。これにおいて3aは金属等からなる密閉ケー
ス、4は電源側端子、5は負荷側端子、6はケース内に
備えられた開閉部を示し、周知の如く固定電極7とそれ
に接離する可動電極8とからなる0次に9.10はサイ
リスクで、図示される如(逆並列に接続してあり、それ
らを上記固定電極7と可動電極8との間に並列に接続し
である。9a、10aはトリガ端子(ゲート)を示す、
11は受光素子で、アークを検出して電気信号を発する
ようにしたものであり、フォトダイオード或いはアバラ
ンシェフォトダイオードが用いられる。12は増幅器を
示す、向上記受光素子11と増幅器12とから成る部分
は、光モジュールとして知られているものを用いればよ
い。
(Embodiments) The drawings showing the embodiments of the present application will be explained below. In Figure 1, l is a single-phase to three-phase AC power supply, 2
is a load, and 3 is a high-voltage load switch interposed between the power source and the load. In this figure, 3a is a sealed case made of metal or the like, 4 is a power supply side terminal, 5 is a load side terminal, 6 is an opening/closing part provided in the case, and as is well known, a fixed electrode 7 and a movable electrode 8 that comes into contact with and separate from it. and 9.10 are cyrisks, which are connected in antiparallel as shown in the figure, and are connected in parallel between the fixed electrode 7 and the movable electrode 8. 9a, 10a indicates the trigger terminal (gate),
Reference numeral 11 denotes a light receiving element which detects an arc and emits an electric signal, and is a photodiode or an avalanche photodiode. Reference numeral 12 indicates an amplifier. The portion consisting of the light receiving element 11 and the amplifier 12 may be a known optical module.

上記構成のものにあっては、開閉部6において固定電極
7と可動電極8とが接続された状態においては、交流電
源1からの交流電力はその開閉部6を通って負荷2に供
給される。
In the above configuration, when the fixed electrode 7 and the movable electrode 8 are connected in the opening/closing section 6, AC power from the AC power source 1 is supplied to the load 2 through the opening/closing section 6. .

次に開閉部6を開放する時の動作を説明する。可動電極
8が手動操作により動かされて固定電極7から離反し始
めると、それらの間にアークが発生し始める。受光素子
11はその初期アークを検出し電気信号を増幅器12に
与える。増幅器12は上記信号を受けてサイリスタ9.
10のトリガ端子9a。
Next, the operation when opening/closing section 6 will be explained. When the movable electrode 8 is manually moved and begins to separate from the fixed electrode 7, an arc begins to occur between them. The light receiving element 11 detects the initial arc and provides an electrical signal to the amplifier 12. Amplifier 12 receives the above signal and operates thyristor 9.
10 trigger terminals 9a.

10aにトリガ信号を与える。するとサイリスタ9及び
10は、固定電極7と可動電極8との間のその時の電気
的な極性に応じて、その何れか一方が導通ずる。従って
端子4,5の間においてはその導通した側のサイリスタ
によって通電が行われ、固定電極7と可動電極8との間
は無電圧となって上記アークが消滅する。やがて電源1
の位相がθ″又は180@となって端子4.5間がOボ
ルトとなると、上記導通したサイリスタ9又はlOはオ
フとなる。上記初期アークが消されて上記のようにサイ
リスクがオフとなるまでの間において周知の如く可動電
極8は固定電極7から充分に離間させられている為、上
記サイリスタ9又は10がオフとなる事によって端子4
.5間は電気的に完全に遮断され、負荷2への電源供給
が断たれる。向上記サイリスク9.lOには長くても半
波しか電流が流れない為、電流定格(容量)の小さなも
の(例えば30A)で足りる(瞬時通電は600A程度
まで可能)。
A trigger signal is given to 10a. Then, one of the thyristors 9 and 10 becomes conductive depending on the electrical polarity between the fixed electrode 7 and the movable electrode 8 at that time. Therefore, current is supplied between the terminals 4 and 5 by the thyristor on the conducting side, and there is no voltage between the fixed electrode 7 and the movable electrode 8, so that the arc is extinguished. Eventually power supply 1
When the phase of becomes θ'' or 180@ and O volt is applied between the terminals 4.5, the conductive thyristor 9 or lO turns off.The initial arc is extinguished and the thyristor turns off as described above. As is well known, since the movable electrode 8 is sufficiently spaced from the fixed electrode 7, when the thyristor 9 or 10 is turned off, the terminal 4
.. 5, the electrical power is completely cut off, and the power supply to the load 2 is cut off. Shoki Cyrisk 9. Since current flows through IO only for half a wave at most, a device with a small current rating (capacity) (for example, 30A) is sufficient (instantaneous energization is possible up to about 600A).

次に本願の異なる実施例を示す図面第2図について説明
する。この例はサイリスタとして光サイリスタ13.1
4を用いると共に、それらの受光部と開閉部6eとの間
に、初期アークを検出してそれをサイリスクの受光部に
伝えるようにしたライトガイド(光ファイバー> 15
.16を配設した例を示すものである。
Next, FIG. 2, a drawing showing a different embodiment of the present application, will be described. This example uses optical thyristor 13.1 as a thyristor.
4, and a light guide (optical fiber> 15
.. 16 is shown.

このような構成のものにあっては固定電極7eと可動電
極8eとの間で初期アークが発生し始めると、その光が
ライトガイド15.16を通してサイリスタ13.14
に与えられ、前記の場合と同様に電源の極性に応じてそ
れらのサイリスタ13.14の内の一方が導通し、前記
と同様にアークを消す動作が行われる。
With such a configuration, when an initial arc begins to occur between the fixed electrode 7e and the movable electrode 8e, the light passes through the light guide 15.16 and reaches the thyristor 13.14.
As in the previous case, one of the thyristors 13, 14 becomes conductive depending on the polarity of the power supply, and the arc extinguishing operation is performed in the same manner as above.

上記構成の回路はサイリスクのゲート信号回路が筒素化
されると共に、ゲート信号回路の絶縁の考慮が不要であ
る。
In the circuit of the above configuration, the gate signal circuit of Cyrisk is made into a cylinder, and there is no need to consider the insulation of the gate signal circuit.

なお、機能上前図のものと同−又は均等構成と考えられ
る部分には、前回と同一の符号にアルファベア)のeを
付して重複する説明を省略した。
It should be noted that parts that are considered to have the same or equivalent structure as those in the previous figure in terms of function are given the same reference numerals as in the previous figure with an e (alphabeta), and redundant explanations are omitted.

(また次回のものにおいても同様の考えでアルファベッ
トのfを付して重複する説明を省略する。
(Also, in the next version, the same idea will be used, and the letter f will be added to omit the redundant explanation.

次に第3図は本願の更に異なる実施例を示すもので、光
サイリスクを備えた開閉器の具体的構造を示すものであ
る0図において21.22はブッシングで、磁器或いは
エポキシ樹脂で形成される。23は接続端子4fに固定
した導電材製の取付片で、サイリスタ13f、14fが
取付けである。尚サイリスタ13fと14fは紙面と垂
直な方向に並設されている。上記サイリスタ13fにお
いて、24はアノード、25はカソードを示す、26は
ライトガイド15fにおける受光検出部を示し、チュー
リップ形の固定電極7fに近接して設けである。尚サイ
リスタ14【に対するライトガイドもライトガイド15
fと並べて同様に構成されている。27は取付片23に
固定した絶縁材製の支持体で、可動電極8fに接触する
補助接触片28が取付けである。29は接続片を示す。
Next, Fig. 3 shows a further different embodiment of the present application, and shows the specific structure of a switch equipped with a light switch. In Fig. 0, 21 and 22 are bushings made of porcelain or epoxy resin. Ru. Reference numeral 23 denotes a mounting piece made of a conductive material fixed to the connection terminal 4f, to which the thyristors 13f and 14f are attached. Note that the thyristors 13f and 14f are arranged in parallel in a direction perpendicular to the plane of the drawing. In the thyristor 13f, 24 indicates an anode, 25 indicates a cathode, and 26 indicates a light receiving detection section in the light guide 15f, which is provided close to the tulip-shaped fixed electrode 7f. The light guide for the thyristor 14 is also the light guide 15.
It is arranged in the same way as f. Reference numeral 27 denotes a support made of an insulating material fixed to the mounting piece 23, and is attached to the auxiliary contact piece 28 that contacts the movable electrode 8f. 29 indicates a connecting piece.

30は固定電極7fに周設した引締め用のコイルスプリ
ングである。 31は開閉用の操作軸で、開閉用レバー
32が取付けてありレバー32の矢印方向への揺動によ
って可動型8isrが矢印方向に直線運動するようにな
っている。尚本例においては、負荷側の接続端子5fと
してチューリップ形のものが用いてあり、コイルスプリ
ング34によって引き締められている。
30 is a tightening coil spring provided around the fixed electrode 7f. Reference numeral 31 denotes an operating shaft for opening/closing, to which an opening/closing lever 32 is attached, and as the lever 32 swings in the direction of the arrow, the movable type 8isr moves linearly in the direction of the arrow. In this example, a tulip-shaped connection terminal 5f on the load side is used, and is tightened by a coil spring 34.

上記構成のものにあっては、図示される如き投入状態に
おいて電流は電源側端子4f、固定電極7f、可動電極
8f、負荷側端子5fの主回路に流れる。
In the above configuration, in the ON state as shown in the figure, current flows through the main circuit of the power supply terminal 4f, the fixed electrode 7f, the movable electrode 8f, and the load terminal 5f.

上記状態において、操作軸31の開放操作により可動電
極8fが図の状態から右方へ移動し始め、先@33が固
定電極7fから離れると、先端33と固定電極7fとの
間にアークが発生し始める。そのアークは受光検出部2
6で捕らえられ、捕らえられた光がライトガイド15f
を通してサイリスタ13fに伝えられる(サイリスク1
4fも同様)。するとサイリスタ13f又は14fが導
通し、接続端子4rと可動電極8fとの間においては取
付片23、サイリ、113f(又は14f)、接続片2
9、補助接触片28を通る経路で通電がなされる。その
結果、固定電極7fと可動電極8fの先端33との間は
無電圧となり、上記アークが消滅する。やがて電源の位
相が0″又は1806となるとサイリスタ13f(又は
14、f)はオフとなり、接続端子4f、5f間の通電
が遮断される。更に引き続いて可動電極8fが右方へ移
動することによりやがてその先端33が補助接触片28
から離れるが、その時には既にサイリスタ13r (又
は14f)がオフとなっている為、先端33が補助接触
片28から離れてもそこでアークが生ずるようなことは
無い、このようにして先端33rが想像線で示される如
き位置まで至ることにより、接続端子4f、5f間は機
械的に完全に開放された状態となる。
In the above state, when the operating shaft 31 is opened, the movable electrode 8f begins to move to the right from the state shown in the figure, and when the tip @33 separates from the fixed electrode 7f, an arc is generated between the tip 33 and the fixed electrode 7f. Begin to. The arc is the light receiving detection part 2
6 and the captured light is captured by light guide 15f.
is transmitted to thyristor 13f through
The same applies to 4f). Then, the thyristor 13f or 14f becomes conductive, and the mounting piece 23, the thyristor 113f (or 14f), and the connecting piece 2 are connected between the connecting terminal 4r and the movable electrode 8f.
9. Electricity is applied through the path passing through the auxiliary contact piece 28. As a result, there is no voltage between the fixed electrode 7f and the tip 33 of the movable electrode 8f, and the arc disappears. Eventually, when the phase of the power supply reaches 0'' or 1806, the thyristor 13f (or 14, f) turns off, cutting off the current flow between the connection terminals 4f and 5f.Furthermore, as the movable electrode 8f moves to the right, Eventually, the tip 33 becomes the auxiliary contact piece 28.
However, at that time, the thyristor 13r (or 14f) is already turned off, so even if the tip 33 separates from the auxiliary contact piece 28, no arc will be generated there. By reaching the position shown by the line, the connection terminals 4f and 5f are mechanically completely opened.

一方開閉器を投入する場合においては、可動電極8fが
想像線で示される位置から左方へ移動してくると先ず先
端33が補助接触片2日に接触する。この場合、サイリ
スタはオフとなっている為、何等の現象も生じない、や
がて先端33が固定電極7fに橿めて近接すると両者間
において先行放電のアークが発生する。このアークは受
光検出部26で検出されてライトガイドを通ってサイリ
スクに与えられ、サイリスタがオン状態となる。その結
果、サイリスタが可動電極8fと接続端子4fとの間の
電流を分担する。その結果アークが消滅する。
On the other hand, when the switch is turned on, when the movable electrode 8f moves to the left from the position indicated by the imaginary line, the tip 33 first comes into contact with the auxiliary contact piece 2. In this case, since the thyristor is off, no phenomenon occurs; eventually, when the tip 33 approaches the fixed electrode 7f, a preliminary discharge arc occurs between the two. This arc is detected by the light receiving detection section 26 and is applied to the thyristor through the light guide, thereby turning on the thyristor. As a result, the thyristor shares the current between the movable electrode 8f and the connection terminal 4f. As a result, the arc disappears.

そして可動電極8fが更に左方に動いて先端33が固定
電極7fに完全に接触すると極間電圧が0となり、サイ
リスクに流れる電流がその保持電流以下となってサイリ
スタはオフ状態となる。この状態において、電流は電源
側端子4f、固定電極7f1可動電極Br、負荷側端子
5fの主回路に流れる状態となる。
When the movable electrode 8f further moves to the left and the tip 33 comes into complete contact with the fixed electrode 7f, the voltage between the electrodes becomes 0, the current flowing through the thyristor becomes less than its holding current, and the thyristor turns off. In this state, current flows through the main circuit of the power supply terminal 4f, the fixed electrode 7f1, the movable electrode Br, and the load terminal 5f.

(発明の効果) 以上のように本発明にあっては、高圧
負荷開閉器3における可動電極8と固定電極7とを電源
1から負荷2への電路の遮断の為に離反させる場合、そ
れら両電極間でアークが生じかけても、予め上記両電極
間に接続しておいたサイリスク9.10を、そのアーク
によって導通させて上記両電極間を無電圧にして上記ア
ークを消すことができ、上記可動電極8及び固定電極7
の消耗を防止できる効果がある。
(Effects of the Invention) As described above, in the present invention, when the movable electrode 8 and the fixed electrode 7 in the high-voltage load switch 3 are separated in order to interrupt the electric path from the power supply 1 to the load 2, Even if an arc is about to occur between the electrodes, the arc can be made conductive by the arc to the Cyrisk 9.10 connected in advance between the two electrodes, and the arc can be extinguished by creating no voltage between the two electrodes. The movable electrode 8 and the fixed electrode 7
It has the effect of preventing wear and tear.

しかも上記の場合、可動と固定の両電極間で生ずるアー
クによってサイリスクを導通させるから、アークの発生
に対してサイリスクの導通による消弧作用の逐行をぴっ
たりと同期させることができ、消弧の確実性を高め得る
効果がある。
Moreover, in the above case, since the arc generated between the movable and fixed electrodes conducts the Cyrisk, the arc extinguishing action due to the conduction of the Cyrisk can be precisely synchronized with the generation of the arc, and the arc extinguishing This has the effect of increasing certainty.

【図面の簡単な説明】[Brief explanation of the drawing]

図面は本願の実施例を示すもので、第1図は電源と負荷
との間の接続回路のブロック図、第2図は異なる実施例
を示す第1図と同様の図、第3図は更に異なる実施例を
示すもので開閉器の縦断面図。 1・・・電源、2・・・負荷、7・・・固定電極、8・
・・可動電極、9.10・・・サイリスク。 第1図 第2図
The drawings show an embodiment of the present application, and FIG. 1 is a block diagram of a connection circuit between a power source and a load, FIG. 2 is a diagram similar to FIG. 1 showing a different embodiment, and FIG. 3 is a further diagram. FIG. 7 is a vertical cross-sectional view of a switch showing a different embodiment. 1...Power source, 2...Load, 7...Fixed electrode, 8...
...Movable electrode, 9.10...Sirisk. Figure 1 Figure 2

Claims (1)

【特許請求の範囲】[Claims] 電源と負荷との間に電路開閉用の可動電極及び固定電極
を備えた高圧負荷開閉器を介在せしめ、しかも上記可動
電極と固定電極に対しては逆並列接続したサイリスタを
並列に接続しておき、上記可動電極と固定電極とを上記
電路の遮断の為に離反させるときには、上記サイリスタ
をそれら両電極間で生ずるアークによって導通させるこ
とにより、上記両電極間を無電圧にして上記アークを消
すことを特徴とする高圧負荷開閉器における消弧方法。
A high-voltage load switch equipped with a movable electrode and a fixed electrode for switching the electric circuit is interposed between the power source and the load, and a thyristor connected in anti-parallel is connected in parallel to the movable electrode and the fixed electrode. When the movable electrode and the fixed electrode are separated in order to interrupt the electric circuit, the thyristor is made conductive by an arc generated between the two electrodes, thereby eliminating the voltage between the two electrodes and extinguishing the arc. A method for extinguishing an arc in a high-voltage load switch characterized by:
JP9647385A 1985-05-07 1985-05-07 Extinction of arc for high tension load switch Granted JPS61256517A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP9647385A JPS61256517A (en) 1985-05-07 1985-05-07 Extinction of arc for high tension load switch
US06/848,187 US4754360A (en) 1985-05-07 1986-04-04 Arc extinguishing apparatus having sensing of initial arc

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9647385A JPS61256517A (en) 1985-05-07 1985-05-07 Extinction of arc for high tension load switch

Publications (2)

Publication Number Publication Date
JPS61256517A true JPS61256517A (en) 1986-11-14
JPH0568810B2 JPH0568810B2 (en) 1993-09-29

Family

ID=14166010

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9647385A Granted JPS61256517A (en) 1985-05-07 1985-05-07 Extinction of arc for high tension load switch

Country Status (1)

Country Link
JP (1) JPS61256517A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011032306A1 (en) * 2009-09-16 2011-03-24 深圳市英赛威科技有限公司 Mechano-electronic type dc switch

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3112985B1 (en) 2020-08-03 2023-11-17 Maco Pharma Sa Device for welding a pocket

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5342108A (en) * 1976-09-29 1978-04-17 Sumitomo Electric Ind Ltd Sintered alloy superior in wear resistance

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5342108A (en) * 1976-09-29 1978-04-17 Sumitomo Electric Ind Ltd Sintered alloy superior in wear resistance

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011032306A1 (en) * 2009-09-16 2011-03-24 深圳市英赛威科技有限公司 Mechano-electronic type dc switch

Also Published As

Publication number Publication date
JPH0568810B2 (en) 1993-09-29

Similar Documents

Publication Publication Date Title
US4849590A (en) Electric switch with counteracting electro-electro-dynamic forces
US4538039A (en) Composite circuit breaker
US3395316A (en) Electric switch with contact protector
AU588611B2 (en) Fuse for an alternating current power circuit
WO1999012176A3 (en) High voltage circuit-breaker with a counter-contact which can be actuated
US4754360A (en) Arc extinguishing apparatus having sensing of initial arc
JPS61256517A (en) Extinction of arc for high tension load switch
US3588406A (en) High voltage beaver tail type switch with preinsertion resistor
KR950034329A (en) Rotary arc interrupter for load disconnect switch
JPS61260516A (en) Arc extinguishing for high pressure load switch
JPH0770277B2 (en) High-voltage load switch
US3614353A (en) Switching device having electro-magnetic means for increasing effective contact pressure
KR880001244B1 (en) Arcless switch
US5874873A (en) Electric control apparatus
JPH0430752Y2 (en)
JPH0447876Y2 (en)
CN215069799U (en) Vacuum circuit breaking device for steel plant
US4698607A (en) High speed contact driver for circuit interruption device
JPH057709Y2 (en)
KR890004957B1 (en) Magnetic contactor
JP3402135B2 (en) Vacuum switch and vacuum switchgear
JP4145384B2 (en) Electrical devices with contacts that can be separated while alternating current is flowing
JPH11265644A (en) Switching device
NO317375B1 (en) Gas insulated load disconnector with extinguishing coil
JP2017126467A (en) Dc switch for wall

Legal Events

Date Code Title Description
R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

EXPY Cancellation because of completion of term